For a luxurious experience, rent a car with a driver or book a private car service. Expect to pay around $100-$200 per day for a driver or private car. Regular taxis and ride-sharing services are also available but could be less comfortable and slower.
If you have an additional day, consider a trip to the famous Griffith Observatory for breathtaking views of the city from above, plus exhibitions on space and science. If you only have two days, you could shorten your visit to the Huntington Library, Art Museum and Gardens or the Norton Simon Museum. Alternatively, spend a half-day exploring the city of Pasadena for many food and art experiences outside of Alhambra.
Alhambra is served by Los Angeles International Airport (LAX), Burbank Bob Hope Airport (BUR) and Ontario International Airport (ONT). LAX is the closest airport, about 30 minutes' drive from the Alhambra center, while BUR and ONT are around 40-45 minutes away by car.